The Inverse Of A 2 × 2 Matrix - Casio fx-3650P Programming Manual

24 The inverse of a 2 × 2 matrix.
The inverse of the ２×２ matrix

d b –
1
----------------- -

ad bc –
c – a

As is clear from the formula above, when the denominator
Ｌｂｌ １：？→ Ａ：？→ Ｂ：？→ Ｃ：？→ Ｄ：ＡＤ － ＢＣ → Ｍ：Ｍ ＝０⇒ Ｇｏｔｏ １：
Ａ→Ｘ ： Ｄ÷Ｍ→Ａ ： Ｘ÷Ｍ→Ｄ ： －Ｂ÷Ｍ→Ｂ ： －Ｃ÷Ｍ→Ｃ ： Ａ
INPUT A, B, C, D : matrix
OUTPUT A, B, C, D : inverse of matrix
The inverse matrix of
Prog 1
1 EXE 4
2 EXE 4
EXE
EXE
EXE
For
ad bc – =
34

a b

 c d
 a b   
1 0
   
=
c d
    0 1

a b

c d

  
1 –
1 4
  
is
 2 4   0.5
EXE
EXE
, the inverse does not exist and the values
0
 
d
1
----------------- -
 
is
ad bc –
  c – a



a



 
a b
 
c d
 

1

–
0.25 
S A M
S A
M
S A M
S A M

b –

. In other words,

d
– bc = 0
, no inverse exists.
Ｄ ＜71 STEP＞
Ｂ Ｃ
P1 P1 P2 P3 P4 D R
P1 P1 P2 P3 P4 D R
P1 P1 P2 P3 P4 D R
P1 P1 P2 P3 P4 D R
and must be re-entered.
a b c , , d
G
Disp
G
Disp
G
Disp
G